<template>
	<view class="cate-container" :style="{ 'margin-top': marginTop + 'px' }">
		<view class="scroll-view-container">
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{ height: wh + 'px' }">
				<block v-for="(item,index) in cateList" :key="index">
					<view  :class="['left-scroll-view-item', active === index ? 'active' : '']" @click="changeActive(index)">{{ item.cat_name }}</view>
				</block>
			</scroll-view>
			<scroll-view scroll-y="true" class="right-scroll-view" :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,index) in cateLevel2" :key="index">
					<view class="cate-lv2-title">/{{ item2.cat_name }}</view>
					<!-- 渲染三级分类数据 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i) in item2.children" :key="i" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon" mode="widthFix"></image>
							<text>{{ item3.cat_name }}</text>
						</view>
					</view>
				</view>
			</scroll-view>
			
		</view>
		<!-- 使用自定义的搜索组件 -->
		<my-search @click="gotoSearch"></my-search>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				cateList: [],
				wh: 0, //窗口视口高度
				active: 0, //当前激活项
				cateLevel2: [], //二级分类列表
                scrollTop: 0,
				marginTop: 0
			}
		},
		onLoad () {
			if (uni.getSystemInfoSync().platform === 'devtools') {
				this.marginTop = 50
			}
			// 获取分类数据
			this.getCateList()
			this.wh = uni.getSystemInfoSync().windowHeight
		},
		methods: {
			async getCateList () {
				const { data: res } =  await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				// 二级分类
				this.cateLevel2 = res.message[0].children
			},
			// 切换以及分类的处理函数
			changeActive (index) {
				this.active = index
				this.cateLevel2 = this.cateList[index].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			// 跳转到商品列表页
			gotoGoodsList (cateLv3) {
				console.log(cateLv3)
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + cateLv3.cat_id
				})
			},
			// 跳转到分包中的搜索页面
			gotoSearch () {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss"scoped>
	.scroll-view-container{
		display: flex;
		// margin-top: 50px;
		.left-scroll-view{
			width: 120px;
			.left-scroll-view-item{
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;
				// 添加激活样式
				&.active {
					background-color: #ffffff;
					position: relative;
					// 渲染激活项左侧的红色指示边线
					&::before {
						display: block;
						content: '';
						width: 4px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}
		.cate-lv2-title{
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}
		.cate-lv3-list{
			display: flex;
			flex-wrap: wrap;
			.cate-lv3-item{
				width: 33.333%;
				margin-bottom: 10px;
				display: flex;
				flex-direction: column;
				align-items: center;
				image {
					width: 60px;
					height: 60px;
				}
				text {
					font-size: 12px;
				}
			}
		}
	}

</style>
